<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Cloud
 * @subpackage StorageService
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */

require_once 'Zend/Cloud/AbstractFactory.php';

/**
 * @category   Zend
 * @package    Zend_Cloud
 * @subpackage StorageService
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Cloud_StorageService_Factory extends Zend_Cloud_AbstractFactory {
	const STORAGE_ADAPTER_KEY = 'storage_adapter';
	
	/**
	 * @var string Interface which adapter must implement to be considered valid
	 */
	protected static $_adapterInterface = 'Zend_Cloud_StorageService_Adapter';
	/**
	 * Constructor
	 *
	 * @return void
	 */
	private function __construct() {
		// private ctor - should not be used
	}
	
	/**
	 * Retrieve StorageService adapter
	 *
	 * @param  array $options
	 * @return void
	 */
	public static function getAdapter($options = array()) {
		$adapter = parent::_getAdapter ( self::STORAGE_ADAPTER_KEY, $options );
		if (! $adapter) {
			require_once 'Zend/Cloud/StorageService/Exception.php';
			throw new Zend_Cloud_StorageService_Exception ( 'Class must be specified using the \'' . self::STORAGE_ADAPTER_KEY . '\' key' );
		} elseif (! $adapter instanceof self::$_adapterInterface) {
			require_once 'Zend/Cloud/StorageService/Exception.php';
			throw new Zend_Cloud_StorageService_Exception ( 'Adapter must implement \'' . self::$_adapterInterface . '\'' );
		}
		return $adapter;
	}
}
